JP7173995B2 - Image processing device, adhesion state inspection device, and adhesion state inspection method for inspecting adhesion state of laminated core - Google Patents

Description

The present invention relates to an image processing device, a bonding state inspection device, and a bonding state inspection method for inspecting the bonding state of a laminated core.

2. Description of the Related Art As a rotor or stator of an electric motor, there is known one having a laminated core in which a plurality of steel plates are adhered with an adhesive (for example, Patent Document 1).

Conventionally, inspection of the state of adhesion of a laminated core is performed by peeling off two adjacent steel plates that are adhered to each other in a completed laminated core, and inspecting an area where an adhesive exists on the bonding surfaces of the two steel plates. is carried out by visual inspection.

JP 2009-124828 A

Visual inspection of the adhesion state of the laminated core places a heavy workload on the operator, requires experience, and makes it difficult to stably and accurately inspect the adhesion state.

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to reduce the work burden on the operator and ensure that the inspection of the adhesion state of the laminated core is performed accurately and stably.

An image processing apparatus for inspecting the adhesion state of a laminated core according to one embodiment of the present invention is an image processing apparatus for inspecting the adhesion state of a laminated core in which a plurality of steel plates are adhered with an adhesive. an image data input processing unit for inputting image data of the mutual bonding surfaces of the two steel plates; A bonding area extraction unit for extracting an area, and a union of the bonding areas obtained by superimposing the bonding areas of the respective bonding surfaces extracted by the bonding area extracting unit at corresponding positions. and an evaluation information output processing unit for outputting information on evaluation of the adhesion state by the adhesion state evaluation unit.

According to this configuration, the inspection of the adhesion state of the laminated core can be performed accurately and stably while reducing the work burden on the operator.

In the image processing apparatus for inspecting the adhesion state of the laminated core, preferably, the adhesion state evaluation section evaluates the adhesion state of the laminated core based on the area of the evaluation target area.

According to this configuration, the adhesion state of the laminated core can be accurately evaluated based on the adhesion area.

In the image processing apparatus for inspecting the state of adhesion of the laminated core, preferably, the state of adhesion evaluation unit evaluates the state of adhesion of the laminated core based on the diameter of a circle circumscribing the area to be evaluated.

According to this configuration, the evaluation of the adhesion state of the laminated core is accurately performed by the diameter of the circle circumscribing the evaluation target area.

In the image processing apparatus for inspecting the adhesion state of the laminated core, preferably, a plurality of island-like application positions of the adhesive are set in advance on the adhesion surface of each of the steel plates, and the adhesion state evaluation unit comprises: The area of the evaluation target area of the adhesive area existing at the position is calculated, and the adhesion state is evaluated based on the total area of the evaluation target areas at the plurality of application positions.

According to this configuration, the adhesion state of the laminated core can be accurately evaluated based on the total adhesion area.

In the image processing apparatus for inspecting the state of adhesion of the laminated core, preferably, the state of adhesion evaluation unit extracts a shape feature of each of the two steel plates from the image data, and converts the shape feature to the shape feature. and a positional relationship correction unit that corrects the bonding positional relationship of the bonding regions based on the positional relationship.

According to this configuration, even if the bonding positional relationship of the bonding regions is physically deviated, the deviation is eliminated by the image processing, and the evaluation target region is generated with high accuracy.

An apparatus for inspecting the state of adhesion of a laminated core according to one embodiment of the present invention is an apparatus for inspecting the state of adhesion of a laminated core, in which a plurality of steel plates are adhered with an adhesive, and which is linearly guided by a fixed linear guide rail. a linear table that can be guided and moved; a linear table driving device that moves the linear table in the linear direction; two rotary tables that are rotatably provided on the linear table about an axis perpendicular to the linear table; A rotary table driving device that rotates two rotary tables, two cameras that individually photograph the bonding surfaces of the steel plates placed on the two rotary tables, and bonding according to the above-described embodiment. and an image processing device for condition inspection, wherein the image data input processing section of the image processing device receives image data from each of the two cameras.

According to this configuration, the inspection of the adhesion state of the laminated core can be performed accurately and stably while reducing the work burden on the operator.

The apparatus for inspecting the state of adhesion of laminated cores preferably further includes an ultraviolet irradiation device for irradiating ultraviolet rays onto the region of the adhesion surface photographed by each of the cameras.

According to this configuration, the bonding area is clearly photographed, and the inspection accuracy of the bonding state is improved.

A method for inspecting the state of adhesion of a laminated core according to one embodiment of the present invention is a method of inspecting the state of adhesion of a laminated core in which a plurality of steel plates are adhered with an adhesive, wherein a step of separating the steel plates from each other; a step of photographing the adhesive surfaces of the two separated steel plates with a camera; is given as a union of both the adhesion areas obtained by extracting the adhesion area where the is present by an image processing device, and superimposing the extracted adhesion areas of the adhesion surfaces at corresponding positions. The method includes a step of evaluating the adhesion state of the laminated core based on the evaluation target area, and a step of outputting information regarding the evaluation of the adhesion state.

According to this inspection method, the adhesion state of the laminated core can be evaluated accurately.

In the method for inspecting the state of adhesion of a laminated core, preferably, the step of separating the two steel plates from each other is performed after the adhesive is cured.

According to this inspection method, the adhesion state of the laminated core can be accurately evaluated without the adhesive flowing in the step of separating the two steel plates.

In the method for inspecting the state of adhesion of a laminated core, when there are a plurality of island-shaped adhesion areas on the adhesion surface, the step of evaluating the adhesion state is performed for each adhesion area individually or collectively for a plurality of adhesion areas. may be done.

According to this inspection method, the adhesion state can be inspected efficiently.

In the method for inspecting the state of adhesion of a laminated core, preferably, in the step of evaluating the state of adhesion, the state of adhesion of the laminated core is evaluated based on the area of the area to be evaluated.

According to this inspection method, the adhesion state of the laminated core can be accurately evaluated based on the adhesion area.

In the method for inspecting the state of adhesion of the laminated core, preferably, in the step of evaluating the state of adhesion, the state of adhesion of the laminated core is evaluated based on the diameter of a circle or an ellipse that circumscribes the area to be evaluated.

According to this inspection method, the adhesion state of the laminated core can be accurately evaluated by the diameter of the circle circumscribing the area to be evaluated.

In the method for inspecting the state of adhesion of a laminated core, preferably, each of the steel plates has a plurality of island-like application positions of the adhesive on the adhesion surface, and the step of evaluating the adhesion state is performed at the plurality of application positions. The adhesion state is evaluated based on the total area of the evaluation target regions.

According to this inspection method, the adhesion state of the laminated core can be accurately evaluated based on the total adhesion area.

In the method for inspecting the state of bonding of a laminated core, it is preferable that a characteristic shape portion of each of the two steel plates is extracted from the image data, and the bonding positional relationship of the bonding regions is corrected based on the characteristic shape portion. including the step of

According to this inspection method, even if the bonding positional relationship of the bonding regions is physically deviated, the deviation is eliminated by the image processing, and the evaluation target region is generated with high accuracy.

In the method for inspecting the state of adhesion of the laminated core, preferably, a fluorescent agent is added to the adhesive, and each adhesion surface is photographed under ultraviolet irradiation.

According to this inspection method, the bonding region is clearly imaged, and the inspection accuracy of the bonding state is improved.

According to the present invention, the inspection of the adhesion state of the laminated core can be performed accurately and stably while reducing the work burden on the operator.

FIG. 1 is a front view showing Embodiment 1 of an apparatus for inspecting the state of adhesion of laminated cores according to the present invention; FIG. 2 is a plan view showing the apparatus for inspecting the state of adhesion of laminated cores according to the first embodiment; 1 is a block diagram showing one embodiment of an image processing apparatus for inspecting the bonding state of laminated cores according to the present invention; FIG. Explanatory drawing of the steel plate peeling process of the laminated core adhesion state method according to the present invention. Explanatory drawing showing Embodiment 1 of the adhesion state inspection method according to the present invention. Explanatory drawing showing Embodiment 2 of the adhesion state inspection method according to the present invention. FIG. 3 is a plan view showing Embodiment 3 of an apparatus for inspecting the state of adhesion of laminated cores according to the present invention; FIG. 11 is a front view showing an apparatus for inspecting the state of adhesion of laminated cores according to Embodiment 3; Explanatory drawing showing Embodiment 3 of the adhesion state inspection method according to the present invention. FIG. 4 is a plan view showing another embodiment of the laminated core bonding state inspection apparatus according to the present invention; FIG. 4 is a plan view showing another embodiment of the laminated core bonding state inspection apparatus according to the present invention; FIG. 4 is a plan view showing another embodiment of the laminated core bonding state inspection apparatus according to the present invention; FIG. 4 is a plan view showing another embodiment of the laminated core bonding state inspection apparatus according to the present invention; FIG. 4 is a perspective view showing another embodiment of the laminated core adhesion state inspection apparatus according to the present invention;

A first embodiment of an apparatus for inspecting the state of adhesion of a laminated core according to the present invention will be described below with reference to FIGS. 1 and 2. FIG.

It has two linear guide rails 12 fixed to the lower frame 10 of the device and extending parallel to each other in the X-axis direction. A single linear table 14 is provided on the linear guide rails 12 so as to straddle the two linear guide rails 12 and is guided by the linear guide rails 12 to be movable in the X-axis direction (linear direction). there is

A ball nut 16 is fixed to the bottom of the linear table 14 . A ball screw shaft 18 extending in the X-axis direction is rotatably attached to the lower frame 10 . A ball screw shaft 18 is threadedly engaged with the ball nut 16 and is rotationally driven by a servomotor 20 attached to the lower frame 10 .

Thus, the servomotor 20, the ball screw shaft 18 and the ball nut 16 form a linear table driving device, and linearly move the linear table 14 in the X-axis direction.

A first rotary table 22 and a second rotary table 24 are provided on the linear table 14 at the same position in the X-axis direction so as to be rotatable about vertical axes A, respectively. Two steel plates 102 and 104 of a laminated core 100 (see FIG. 4) to be inspected are placed on the first rotary table 22 and the second rotary table 24 one by one with their adhesive surfaces 102A and 104A facing upward. It is placed in a state of being positioned by positioning pins 26 and 28 . The steel plates 102, 104 and their bonding surfaces 102A, 104A will be described later.

Servomotors 30 and 32 forming a rotary table driving device are connected to the lower portions of the first rotary table 22 and the second rotary table 24, respectively. The servomotors 30 and 32 divide and rotate the first rotary table 22 and the second rotary table 24 at predetermined rotation angles.

The servomotors 20, 30, 32 are driven and controlled by a table control device 36 such as an NC control device.

The upper frame 38 of the apparatus has a first camera 40 for photographing the bonding surface 102A of the steel plate 102 placed on the first rotary table 22, and the bonding surface of the steel plate 104 placed on the second rotary table 24. A second camera 42 is attached to photograph 104A.

The first camera 40 and the second camera 42 are digital cameras with the same high gradation. As a result, a plurality of coating positions B, which are preset like islands at predetermined intervals in the circumferential direction of the bonding surfaces 102A and 104A, are successively coated with the same optical characteristics (lens characteristics) for each coating position B. to shoot. The first camera 40 and the second camera 42 are connected to an image processing device 60 by cables 44 and 46, and transmit image data of the adhesive surfaces 102A and 104A obtained by photographing to the image processing device 60. FIG.

A touch panel monitor 62 and a printer 64 are connected to the image processing device 60 .

Attached to the upper frame 38 are an ultraviolet lamp 48 for irradiating an area of the bonding surface 102A photographed by the first camera 40 with ultraviolet rays and an ultraviolet lamp 50 for irradiating an area of the bonding surface 104A photographed by the second camera 42 with ultraviolet rays.

Next, details of the image processing device 60 will be described with reference to FIG.

The image processing device 60 is configured by a computer, and the computer executes a program to perform an image data input processing section 66, an adhesion region extraction section 68, an adhesion state evaluation section 70, and an evaluation information output processing section 72. It is embodied by software.

The image data input processing unit 66 inputs image data of a plurality of pixels for each application position B of the adhesive surfaces 102A and 104A from each of the first camera 40 and the second camera 42 . When the image data output from the first camera 40 and the second camera 42 are multivalued, the image data input processing section 66 binarizes the image data with the same threshold for each pixel. As a result, for example, pixels in which the adhesive is not imaged are binarized to "0", and pixels in which the adhesive is imaged are binarized to "1". A binarization threshold is set to a predetermined value by the touch panel monitor 62 . The image data input processing unit 66 includes temporary storage units 65 and 67 such as frame memories for storing the image data of the adhesive surfaces 102A and 104A binarized for each pixel.

The adhesive area extraction unit 68 extracts the adhesive area C (FIG. 5 , FIG. 6) are extracted for each coating position B.

The adhesion state evaluation unit 70 superimposes the adhesion regions C at the respective application positions B extracted by the adhesion region extraction unit 68 with those at corresponding positions, and evaluates the evaluation target regions D (FIGS. 5 and 6) obtained by superimposition. See), the adhesion state of the laminated core 100 is evaluated.

The evaluation information output processing unit 72 outputs information regarding the evaluation of the adhesion state by the adhesion state evaluation unit 70 to the touch panel monitor 62, the printer 64, or the like.

Next, Embodiment 1 of the adhesion state inspection method performed by the adhesion state inspection apparatus according to Embodiment 1 will be described with reference to FIGS. 4 and 5 in addition to FIGS. 1 to 3. FIG.

As shown in FIG. 4A, the laminated core 100 to be inspected is a stack of a plurality of steel plates 102 and 104 which are adhered to each other with an adhesive. is. In the steel plates 102 and 104, a plurality of adhesive application positions (adhesion points) B are set in advance in the form of islands on the adhesion surfaces 102A and 104A at intervals in the circumferential direction. The adhesive may be based on an epoxy resin doped with a fluorescent agent.

When inspecting the state of bonding, first, the upper two steel plates 102 and 104 of the laminated core 100, which has been completed as a product by hardening the adhesive, are separated into three upper layers as shown in FIG. 4(B). Separating from the steel plate 106 (peeling step) is performed. This peeling may be performed manually by an operator or by an automated peeling device.

Next, the two steel plates 102 and 104 that have been separated from the upper layers are separated from each other as shown in FIG. , the first steel plate 102 is turned upside down. The separation of the steel plates 102, 104 from each other may also be done manually by an operator or by an automated separation device.

The steel plate 102 is placed on the first rotary table 22 with the adhesive surface 102A facing upward and positioned by the positioning pins 26, as shown in FIG. The steel plate 104 is placed on the second rotary table 24 with the adhesive surface 104A facing upward and positioned by the positioning pins 28, as shown in FIG.

The placement of the two steel plates 102 and 104 is such that the adhesive application position B is the steel plate 102 and the steel plate 104, which were joined to each other before separation, and are placed on the first rotary table. 22 and the second rotary table 24 at the same position. The same positions on the first rotary table 22 and the second rotary table 24 refer to positions directly below the first camera 40 and the second camera 42, and the same coating positions B of the bonded steel plates 102 and 104 are It is the position to be located.

In this state, the application position B on the adhesive surface 102A and the application position B on the adhesive surface 104A, which were bonded to each other before peeling, are photographed simultaneously by the first camera 40 and the second camera 42 (photographing step). will be The application position B is photographed by the first camera 40 and the second camera 42 by ultraviolet lamps 48 and 50 so that the area where the adhesive is present can be clearly photographed because the adhesive contains a fluorescent agent. It is carried out under UV irradiation.

The image data of the application position B of each adhesive surface 102A, 104A obtained by the first camera 40 and the second camera 42 is input to the image data input processing unit 66 of the image processing device 60, and subjected to preprocessing such as binarization. are stored in the temporary storage units 65 and 67 of the image data input processing unit 66. FIG.

The image data of the application position B of each adhesive surface 102A, 104A stored in the temporary storage unit is sent to the adhesion area extraction unit 68, and each application position is obtained as shown in FIGS. Extraction of the adhesion region C where the adhesive exists in B (extraction step) is performed. For extraction of the adhesion area C, if the image data is binarized, pixels having a value of "1" should be extracted. Since the steel plate 102 at the time of photographing is turned upside down (see FIG. 4(C)) from the laminated and bonded state, the image of the bonding surface 102A of the steel plate 102 is as shown in FIG. 5(C). , image processing is performed to reverse left and right.

This horizontal reversal image processing may be performed on the image data of either one of the bonding surfaces 102A and 104A.

Next, image processing (synthesis processing) is performed by the adhesion state evaluation unit 70 to superimpose the adhesion region C at the application position B on the adhesion surface 102A and the adhesion region C at the application position B on the adhesion surface 104A with the same adhesion positional relationship. is done. As a result of this superposition, as shown in FIG. 5(D), an evaluation target given as a union of the adhesion area C at the application position B on the adhesion surface 102A and the adhesion area C at the application position B on the adhesion surface 104A. Region D is generated. The union is obtained by sequentially performing a logical sum (OR) operation on each pixel. Thus, the evaluation target area D is defined by the outer contours of both adhesive areas C after being superimposed.

Here, the same adhesion positional relationship means that the objects at the corresponding positions are bonded to each other before peeling. The bonding state evaluation unit 70 extracts the shape feature of each of the two steel plates 102 and 104 from the image data of the bonding surfaces 102A and 104A, and determines the bonding positional relationship of the bonding region C based on the extracted shape feature. It includes a positional relationship correction unit that corrects the

This superimposition is obtained from the image data obtained by photographing the bonding surfaces 102A and 104A with the first camera 40 and the second camera 42 in the bonding state evaluation unit 70, and the shape features of each of the two steel plates 102 and 104, for example, , the edge portion of the magnetic pole tooth is extracted, and based on the edge portion, the positional relationship between the adhesion area C at the application position B on the adhesion surface 102A and the adhesion area C at the application position B on the adhesion surface 104A is corrected by image processing. is done.

As a result, there is a deviation (physical deviation) between the bonding area C at the coating position B on the bonding surface 102A on the first rotary table 22 and the second rotary table 24 and the bonding area C at the coating position B on the bonding surface 104A. However, it is eliminated by image processing, and the evaluation target area D is generated with high accuracy.

Then, the adhesion state evaluation unit 70 calculates a circle (ellipse) F that circumscribes the evaluation target area D as shown in FIG. , the major axis diameter G of the circle F is calculated, and if the major axis diameter G is a predetermined threshold value, the determination is "OK", and if the major axis diameter G is less than the predetermined threshold value, the determination is "NG" I do. In this manner, the adhesion state evaluation process is performed by the adhesion state evaluation unit 70 . The threshold in the evaluation process can be variably set by the touch panel monitor 62 according to the required adhesive strength.

As a result, the evaluation of the bonding state of the laminated core 100 can be accurately performed by the major axis diameter G while reducing the work burden on the operator.

As an information output step, the evaluation information output processing unit 72 performs screen display processing to display the evaluation result as an evaluation target area D, a circle F, and a figure of major axis diameter G, as shown in FIG. 5(F). Together, the screen is displayed on the monitor 62 with a touch panel. The area E where the adhesive area C at the application position B on the adhesive surface 102A and the adhesive area C at the application position B on the adhesive surface 104A overlap may be displayed in a different color from the non-overlapping area. Further, the determination result may be printed on paper by the printer 64 together with the graphics of the evaluation target region D, the circle F, and the major axis diameter G by the print output processing by the evaluation information output processing unit 72 . Also, these evaluation information may be written in an external storage device such as a memory card (not shown).

As a result, the evaluation of the bonding state of the laminated core 100 can be performed accurately based on the bonding area while reducing the work burden on the operator.

Evaluation of the adhesion state based on the major axis diameter G is performed by calculating the major axis diameter G in the same manner at all the island-shaped application positions B, and the total number of “OK” and “NG” ” may be performed by the total number of

Next, Embodiment 2 of the adhesion state inspection method performed by the adhesion state inspection apparatus according to Embodiment 1 will be described with reference to FIGS. 4 and 6 in addition to FIGS. 1 to 3. FIG.

From the peeling step shown in FIG. 4 to the superimposed image processing (synthesis processing) shown in FIG.

In the second embodiment, as an evaluation step, the adhesion state evaluation unit 70 performs a process of converting the evaluation target area D into a minute matrix H, and uses the matrix H to convert the evaluation target area D, as shown in FIG. The area J of the region D is calculated, and if the area J is a predetermined threshold value, the determination is "OK", and if the area J is less than the predetermined threshold value, the determination is "NG". This threshold value can also be variably set by the touch panel monitor 62 according to the required adhesive strength.

As a result, the evaluation of the bonding state of the laminated core 100 can be performed accurately based on the bonding area while reducing the work burden on the operator.

This determination result is displayed on the touch panel monitor 62 together with a figure indicating the area J of the evaluation target area D as shown in FIG. may be displayed on the screen. Further, the determination result may be printed on paper by the printer 64 together with a figure indicating the area J of the evaluation target region D by the print output processing by the evaluation information output processing unit 72 . Also, these evaluation information may be written in an external storage device such as a memory card (not shown).

In the evaluation of the bonding state by the area J, the calculation of the area J is performed in the same manner for all the application positions B existing in the form of islands, and the total number of "OK" and the total number of "NG" for each of the bonding surfaces 102A and 104A. , or by their total area.

In addition to the major axis diameter G and the area J, the evaluation of the adhesion state in the adhesion state evaluation unit 70 is based on the diameter of the inscribed circle, the circumscribed circle at a plurality of application positions B or the average diameter of the inscribed circle, the outer contour of the evaluation target area D may be performed by the perimeter of the Further, the adhesion state may be evaluated based on the area of the region E where the adhesion region C at the application position B on the adhesion surface 102A and the adhesion region C at the application position B on the adhesion surface 104A overlap.

Next, Embodiment 3 of the adhesion state inspection device will be described with reference to FIGS. 7 and 8. FIG. The inspection apparatus according to the third embodiment is used for inspecting the bonding state of a laminated core of a type in which one laminated plate is formed by combining a plurality of core pieces divided for each magnetic pole tooth.

The apparatus for inspecting the state of adhesion of laminated cores according to the third embodiment has one fixedly arranged table 80 and a camera 82 fixedly arranged above the table 80 .

Two core pieces 110 and 112 are placed side by side on the table 80 as viewed in FIG. The camera 82 takes an image of the entire bonding surfaces 110A and 112A of the two core pieces 110 and 112 on the table 80 in one shot with an imaging range (image area) L.

The two core pieces 110 and 112, which were adhered to each other by an adhesive, are peeled off after the adhesive is cured, as in the first embodiment, and both adhesive surfaces 110A and 112A are separated. One of the core pieces 110 and 112, for example, the core piece 110, is turned upside down so that the .

The lamination core adhesion state inspection apparatus according to the third embodiment requires only one table 80, the table 80 and the camera 82 are fixedly arranged, and does not include a movable mechanism and a driving device, so that the structure is simple.

Next, Embodiment 3 of the adhesion state inspection method performed by the adhesion state inspection apparatus according to Embodiment 3 described above will be described with reference to FIG. An image processing device equivalent to the image processing device 60 shown in FIG. 3 is also used in the adhesion state inspection method of the third embodiment.

The bonding surfaces 110A and 112A of the two core pieces 110 and 112 on the table 80 are photographed by the camera 82 as a whole. The image data of the bonding surfaces 110A and 112A of the two core pieces 110 and 112 obtained by the photographing are trimmed by the image data input processing unit 66 as shown in FIGS. It is divided into the bonding surface 110A and the bonding surface 112A by processing.

The divided image data is sent to the adhesion area extracting section 68, and extraction of the adhesion area C where the adhesive is present at each application position (extraction step) is performed. For extraction of the adhesion area C, if the image data is binarized, pixels having a value of "1" should be extracted. Since the core piece 110 is turned upside down (see FIG. 4(C)) from the laminated and bonded state at the time of photographing, the image of the adhesive surface 110A of the core piece 110 is shown in FIG. 9(C). , image processing is performed to reverse the left and right.

Next, image processing is performed by the adhesion state evaluation unit 70 to superimpose the adhesion areas C at the application positions on the adhesion surface 110A and the adhesion areas C at the application positions on the adhesion surface 112A with the same adhesion positional relationship. This image processing is collectively performed on a plurality of bonding regions C present in each core piece, and as shown in FIG. An evaluation target area D is generated. Here, the same adhesion positional relationship means that the objects at the corresponding positions are bonded to each other before peeling. The adhesion state evaluation based on the evaluation target area D may be performed for each core piece in the same manner as in the first or second embodiment.

10(A) and 10(B) show another embodiment of the adhesion state inspection apparatus in which the photographing range L of the camera 82 is smaller than that of the third embodiment and only one core piece can be photographed. As shown, the core pieces 110, 112 on the table 80 can be replaced one by one manually or by a robot arm or the like.

When the photographing range L of the camera 82 is small, the two core pieces 110 and 112 placed on the table 80 are shuttled as shown in FIGS. Alternatively, as shown in FIGS. 12A and 12B, the imaging range L with respect to the table 80 may be changed by shuttle movement of the camera. The table 80 may be rotated, as shown in FIGS. 13A and 13B, in addition to the shuttle movement. As shown in FIGS. 14A and 14B, the table 80 is turned upside down by a rotating shaft 86, the core piece 110 is mounted on the front surface 80A of the table 80, and the core piece 110 is mounted on the back surface 80B of the table 80. 112 may be mounted and the two core pieces 110 and 112 may be photographed by turning the table 80 inside out.

Although the present invention has been described in terms of its preferred embodiments, it should be readily apparent to those skilled in the art that the present invention is not limited to such embodiments and that departures from the spirit of the invention are not intended to be construed as limiting the scope of the invention. It can be changed appropriately as long as it does not occur.

The step of peeling off the two bonded steel plates is preferably performed after the adhesive has completely hardened, but this is not essential, and may be performed before complete hardening or in a semi-hardened state. . In order to inspect the bonding state with high accuracy and reliability, it is important that the position of the adhesive does not shift and the shape of the bonding region C does not change before and after the peeling.

The adhesion state may be evaluated in the same manner as the coating position B described above for the coating position K provided on each magnetic pole tooth shown in FIG. The coating position K may be determined by photographing each magnetic pole tooth. The adhesion state may be evaluated based on the diameter of a circle inscribed in the evaluation target area D. FIG.

The laminated core is not limited to a stator core of an electric motor, and may be a stator core of a rotary electric machine, a rotor core, an iron core of a transformer device, or the like.

Moreover, all of the components shown in the above embodiments are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

10: Lower frame 12: Linear guide rail 14: Linear table 16: Ball nut 18: Ball screw shaft 20: Servo motor 22: First rotary table 24: Second rotary table 26: Positioning pin 28: Positioning pin 30: Servo motor 32 : Servo motor 36 : Table control device 38 : Upper frame 40 : First camera 42 : Second camera 44 : Cable 46 : Cable 48 : Ultraviolet lamp 50 : Ultraviolet lamp 60 : Image processing device 62 : Monitor with touch panel 64 : Printer 65: Temporary storage unit 66: Image data input processing unit 67: Temporary storage unit 68: Adhesion region extraction unit 70: Adhesion state evaluation unit 72: Evaluation information output processing unit 80: Table 80A: Front surface 80B: Back surface 82: Camera 84: Positioning pin 86 : Rotating shaft 100 : Laminated core 102 : Steel plate 102A : Adhesion surface 104 : Steel plate 104A : Adhesion surface 106 : Steel plate 110 : Core piece 110A : Adhesion surface 112 : Core piece 112A : Adhesion surface B : Application position C : Adhesion Area D: Evaluation target area E: Overlapping area F: Circle G: Major axis diameter H: Matrix J: Area K: Application position L: Shooting range

Claims (16)

An image processing device for inspecting the adhesion state of a laminated core in which a plurality of steel plates are adhered with an adhesive,
an image data input processing unit for inputting image data of mutual bonding surfaces obtained by reversing one of the two adjacent steel plates;
a bonding area extraction unit that extracts a bonding area where the adhesive exists on each bonding surface from the image data of each bonding surface of the two steel plates;
An image obtained by superimposing one of the bonding areas of each of the bonding surfaces extracted by the bonding area extracting unit at corresponding positions by reversing the front and back on the same axis as the reversal of the steel plate. an adhesion state evaluation unit that evaluates the adhesion state of the laminated core based on the size of the evaluation target area given as the union of the two adhesion areas in the
and an evaluation information output processing section for outputting information regarding the evaluation of the adhesion state by the adhesion state evaluation section. An image processing device for inspecting the adhesion state of a laminated core in which a plurality of steel plates are adhered with an adhesive,
an image data input processing unit for inputting image data of mutual bonding surfaces obtained by reversing one of the two adjacent steel plates;
a bonding area extraction unit that extracts a bonding area where the adhesive exists on each bonding surface from the image data of each bonding surface of the two steel plates;
An image obtained by superimposing one of the bonding areas of each of the bonding surfaces extracted by the bonding area extracting unit at corresponding positions by reversing the front and back on the same axis as the reversal of the steel plate. , an adhesion state evaluation unit that evaluates the adhesion state of the laminated core based on the size of the adhesion regions that overlap each other on both adhesion surfaces, and information regarding the evaluation of the adhesion state by the adhesion state evaluation unit. An image processing apparatus for inspecting the adhesion state of a laminated core, comprising an evaluation information output processing unit for outputting. 2. The image processing apparatus for inspecting the adhesion state of the laminated core according to claim 1 , wherein the adhesion state evaluation unit evaluates the adhesion state of the laminated core based on the area of the evaluation target area. 2. The image processing apparatus for inspecting the adhesion state of the laminated core according to claim 1 , wherein the adhesion state evaluation unit evaluates the adhesion state of the laminated core based on a diameter of a circle circumscribing the evaluation target area. Each of the steel plates has a plurality of island-like application positions of the adhesive on the adhesive surface,
The adhesion state evaluation unit calculates the area of the evaluation target region of the adhesion region present at each application position, and evaluates the adhesion state based on the total area of the evaluation target regions at the plurality of application positions. An image processing apparatus for inspecting the adhesion state of the laminated core according to Item 1. The adhesion state evaluation unit includes a positional relationship correcting unit that extracts a geometrical characteristic portion of each of the two steel plates from the image data and corrects the bonding positional relationship of the adhesion region based on the geometrical characteristic portion. 5. The image processing apparatus for inspecting the bonding state of laminated cores according to claim 1, 3 or 4. A device for inspecting the adhesion state of a laminated core in which a plurality of steel plates are adhered with an adhesive,
a linear table that is linearly guided and movable by fixedly arranged linear guide rails;
a linear table driving device for moving the linear table in the linear direction;
two rotary tables rotatably provided on the linear table around an axis perpendicular to the linear table;
a rotary table driving device for rotating each of the two rotary tables;
two cameras for individually photographing the bonding surfaces of the steel plates respectively placed on the two rotary tables;
and an image processing device for inspecting the adhesion state according to any one of claims 1 to 6,
The image data input processing unit of the image processing device is an adhesion state inspection device for laminated cores, in which image data is input from each of the two cameras. 8. An apparatus for inspecting the state of adhesion of a laminated core according to claim 7, further comprising an ultraviolet irradiating device for irradiating an ultraviolet ray to an area of said bonding surface photographed by each of said cameras. A method for inspecting the adhesion state of a laminated core in which a plurality of steel plates are adhered with an adhesive,
a step of peeling off the two adjacent steel plates that are adhered to each other;
A step of photographing each adhesive surface of one of the two peeled steel plates turned upside down with a camera;
a step of extracting, by an image processing device, a bonding area where the adhesive exists on each bonding surface from image data of each bonding surface obtained by photographing;
Both the bonded regions in the image obtained by superimposing one of the extracted bonded regions of the bonded surfaces at corresponding positions while flipping the steel plates upside down on the same axis. evaluating the adhesion state of the laminated core based on the size of the evaluation target area given as the union of
and a step of outputting information relating to evaluation of the adhesion state. 10. The method for inspecting the state of adhesion of a laminated core according to claim 9, wherein the step of separating the two steel plates from each other is performed after the adhesive is cured. 11. The method according to claim 9, wherein a plurality of said bonding regions are present on said bonding surface in the form of islands, and said step of evaluating said bonding state is performed individually for each said bonding region or collectively for a plurality of said bonding regions. A method for inspecting the adhesion state of a laminated core. 12. The method for inspecting the state of adhesion of a laminated core according to claim 9, wherein the step of evaluating the state of adhesion evaluates the state of adhesion of the laminated core based on the area of the area to be evaluated. 12. The adhesion state of the laminated core according to any one of claims 9 to 11, wherein the step of evaluating the adhesion state evaluates the adhesion state of the laminated core based on a diameter of a circle or an ellipse circumscribing the evaluation target area. Inspection methods. Each of the steel plates has a plurality of island-like application positions of the adhesive on the adhesive surface,
12. The method for inspecting the state of adhesion of a laminated core according to claim 9, wherein the step of evaluating the state of adhesion evaluates the state of adhesion based on a total area of the areas to be evaluated at the plurality of application positions. . 15. The method according to any one of claims 9 to 14, further comprising a step of extracting a shape characteristic portion of each of the two steel plates from the image data and correcting a bonding positional relationship of the bonding regions based on the shape characteristic portion. 10. A method for inspecting the adhesion state of the laminated core according to the above item. 16. The method for inspecting the state of adhesion of a laminated core according to claim 9, wherein a fluorescent agent is added to the adhesive, and each adhesion surface is photographed under ultraviolet irradiation.

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